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<title>Problem 1857. -- [Scoi2010]传送带
</title><center><h2>1857: [Scoi2010]传送带
</h2><span class=green>Time Limit: </span>1 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>64 MB<br><span class=green>Submit: </span>242&nbsp;&nbsp;<span class=green>Solved: </span>123<br>[<a href='submitpage.php?id=1857'>Submit</a>][<a href='problemstatus.php?id=1857'>Status</a>][<a href='bbs.php?id=1857'>Discuss</a>]</center><h2>Description</h2><div class=content>在一个2维平面上有两条传送带，每一条传送带可以看成是一条线段。两条传送带分别为线段AB和线段CD。lxhgww在AB上的移动速度为P，在CD上的移动速度为Q，在平面上的移动速度R。现在lxhgww想从A点走到D点，他想知道最少需要走多长时间
</div><h2>Input</h2><div class=content>输入数据第一行是4个整数，表示A和B的坐标，分别为Ax，Ay，Bx，By
第二行是4个整数，表示C和D的坐标，分别为Cx，Cy，Dx，Dy
第三行是3个整数，分别是P，Q，R
</div><h2>Output</h2><div class=content>输出数据为一行，表示lxhgww从A点走到D点的最短时间，保留到小数点后2位
</div><h2>Sample Input</h2>
			<div class=content><span class=sampledata>0 0 0 100<br />
100 0 100 100<br />
2 2 1<br />
<br />
<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata>136.60<br />
</span></div><h2>HINT</h2>
			<div class=content><p>对于100%的数据，1<= Ax，Ay，Bx，By，Cx，Cy，Dx，Dy<=1000<br />
                 1<=P，Q，R<=10<br />
</p></div><h2>Source</h2>
			<div class=content><p><a href='problemset.html?search=Day2'>Day2</a></p></div><center>[<a href='submitpage.php?id=1857'>Submit</a>][<a href='problemstatus.php?id=1857'>Status</a>][<a href='bbs.php?id=1857'>Discuss</a>]</center>﻿<br>

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